Workshop at Valparai with Guy Theraulaz

During the visit of Prof Theraulaz, we organized an intense workshop on collective behaviour at Valparai, Tamil Nadu from 08.09.2019 to 10.09.2019.

Many students working on collective behaviour from our lab and our collaborator Dr Danny Raj attended the workshop. The workshop focused on the discussion of existing research in the field of collective behaviour and potential future advances in the same.

The team also did a number of field visits to observe wildlife, assisted by extraordinary scientists and staff from Nature Conservation Foundation.

Lab trip to Makalidurga

We made a short one day trip to Makalidurga (pronounced maakaLi-durga, where durga means fort in Kannada). We left early morning 6 am’ish and returned by 4 pm. Was great fun!

Above are some pictures! In pictures taken from above the hills – notice the contrast between blue skies and unmistakable brownish atmospheric layer – the latter most likely being the smog in/around Bengaluru city.

Student updates: collaborations, conferences and interns

A bunch of student related updates.

Phd Students:  Sumithra Sankaran and Sabiha Sachdeva both visited Montpellier, France to initiate collaboration with Dr Sonia Kefi on an Indo-French grant supported by IFCAM. They spent around a month in Montpellier (I was there for the initial one week) and have started working on an interesting collaborative project on spatial patterns in vegetation and other ecological systems. As of today, they finished attending a three day conference in Paris on Mathematical Models in Ecology and Evolution, 2015 with a distinguished list of speakers from various parts of the world. They too gave talks on their ongoing phd thesis work. They are expected to be back in town by the end of this month.

Jaideep Joshi is having great fun at IIASA, Austria at their annual Young Scientist Summer Program. For three months (June-Aug 2015), he will be working with Ake Bronstrom and Ulf Dieckmann, leading theoretical evolutionary biologists, on a spatial model of public goods dilemma.

Interns: Somewhat surprisingly, I ended up accepting quite a few interns this summer! They have all been fantastic.

The first intern was Arpitha who is doing her MSc in math from Christ University. She did a reading project on the evolution of cooperation in networks and also did various simulations related to that. In the process, I got to learn a few basic terminologies of network theory.

Sampada, a fourth year IISc UG student from math department did a simulational project on merge-split models of swarms.

Gokul Nair, a second year IISc UG student wrote efficient codes on swarming using net-logo which are now being used for the experimental work.

Poornima, a second year student from IISER Pune did a reading project on super organisms.

Hans Kaliaden, a third year IISc UG student majoring in biology read about and wrote a net-logo code on vegetation pattern dynamics that has both individual based and reaction-diffusion based dynamics.

Varsha Shenoy, a second year MSc student from Mysore Univerisity is also working on a short project on vegetation pattern formation!

Science is Fun with so many young students around!

Article on “Discovering facts: Finding the longest day with school children” appears in Resonance

Long back, in 2012, I did a very interesting teaching project with primary school children. I also wrote about it in this blog. The same blog article, with some modifications, has been published in Resonance.

Click here for the article (pdf): Discovering Facts: Finding the longest day with school children

For some reasons, there were three footnotes in my article submissions which have been ommitted in the final version. The footnotes were numerically referenced as [1], [2], [3] in the text but what exactly those are got missed out in the final version (my fault to have missed it at the stage of proof). I am posting those below here:

[1] Disclosure: The school is founded by close relatives and friends. You can learn more about it by visiting the website:

[2] A preliminary version of this article appeared in the souvenir of the school in Jan 2013 and has also been put up on my personal/lab blog.

[3] Data for sunrise and sunset for most cities can be downloaded from: (you need to know Longitude and Latitute of the place) OR

Student project on Tipping points wins first prize in Mathematics of Planet Earth 2013 competition

As always I am slow in posting what’s happening in the lab.

ImageThree undergraduate students, one from Physics and two from Math department, who worked with me during the summer of 2013 did a very cool project. They built a physical model to demonstrate the principles underlying early warning signals of tipping points. They submitted this project to a all India level competition organized by TIFR-CAM to celebrate the Mathematics of Planet Earth 2013. In Nov 2013, they were given first prize for their work at the Visvesvaraya Industrial and Technological Museum, Bangalore.

On the right is a picture of students posing with their physical model! Congratulations to Nikunj Goel, Athmanathan and Sriram (left to right) for their excellent work and for winning the prize.

Finding the longest day with school children

I wrote this article a while ago for a school souvenir. I got delayed in posting it here since I wanted to put a picture of the plot of duration of the day that students came up with. I still don’t have the picture, but I decided to post it and update it with the picture whenever it is available. Click here for the pdf of the article.


Date: 21st Dec 2012.

During the year 2011-12, I interacted with students of Purnapramati [1] only once or twice, but I really enjoyed my time with them. I wanted to interact children more regularly this year. So, after discussing with Indumathi akka [2], the science teacher of the school, we thought it would be nice to work on a short-term project where students get some hands-on experience of learning science. Exactly six months ago, on 21st of June 2012, I began interacting with students of 5th class of Purnapramati.

As I kept thinking what could be a feasible short-term yet interesting thing that primary kids can do, I was already in the class and I began my interaction by exchanging greetings. But the answer was elusive until our interactions gained some momentum.

I asked students, “Is today any special day?”. The answer came almost immediately when one student said “Today is summer solstice”.

I then asked the student back, “I have never heard of that. What does that mean?”

One other student laughed and said, “Don’t you know, it is the longest day of the year”.

“May be, but how do you know about this fact?”, I asked.

“We learnt in the class. Our teacher told us”, came a response from one corner.

“How did your teacher know about that?”. I continued my questions.

“From her teacher” was one answer while the other student said “From our text book”.

“How did your teacher’s teacher or even the text book writer knew that 21st June is the longest day in the year?”.

Although I immediately heard the answer “From their teachers”, it was already clear to some students that I was going to ask “How did that teacher come to know?”

After teasing their minds for a bit, I got the answer I was waiting to hear when I one student said “someone must have measured length of day all throughout the year and found it out”.

I then told students, what if your teacher had never told you that June 21st is the summer solstice? If our challenge is to find it out yourself, how will you do it?

I got to hear a lot of creative and courageous solutions which ranged from how they will wake up and note down sunrise time and also sunset time every day. When I asked how can they see precise time of sunrise or sunset if there is a huge building next to their home, some volunteered to go to mountains and deserts where one can see horizon to horizon. Some even thought of setting up automatic devices that will record sunrise and sunset times automatically.

Finally, we all agreed to take a short-cut given difficulties of going out of home to a desert or even that of waking every morning without fail. The short-cut, as suggested by students themselves, was to look at the newspaper (or panchanga) everyday and note down sunrise and sunset times.

Once the concept for the project was ready, it was time for implementation and that took nearly three to four months, working on this at a frequency of twice a month (sometimes even less).  For this class of 12, each student was assigned a specific month and was asked to note down sunrise-sunset time from newspaper collection at their home. Based on that they calculated daytime duration (which they learnt in the process of our project). They also learnt how to use graph sheets and produced nice plots of duration of daytime for each day of their month.

When they finally put together all those data mostly on their own with occasional help from Indumathi akka (science teacher) and myself, we were all extremely fascinated to see the oscillating pattern of duration of the day. Students immediately went back to the original motive of our project, and found based on their own analysis that the duration of the day was maximum for about 10 days towards last two weeks of June. So it was not one day when it was maximum, but for 10 days!

It was probably in all students’ mind as to why does everyone say June 21st as the longest day of the year when there are 10 days that are longest. But they had figured the reason discussing among themselves; they had data of sunrise-sunset only up to minutes accuracy. To find which day of among those 10 days were longest, they said they would need data of sunrise-sunset time unto seconds, or even milliseconds.

While it is clear what students learnt from this exercise, it was also extremely interesting to interact with students, answer their amusing and intelligent questions. It was also revealing to me to learn finer details of such simple facts, which we all take for granted.

[1] Important Disclosure: The school is founded by close relatives and friends. You can learn more about it by visiting the website:

 [2] Teachers are affectionately called akka (meaning sister) or anna (meaning brother) in this school.